import pygame.font

class Button:

	def __init__(self,ai_game,msg):
		"""初始化按钮的属性"""
		self.screen=ai_game.screen
		self.screen_rect=self.screen.get_rect()

		#设置按钮的尺寸和其他属性
		self.width,self.height=200,50
		self.button_color=(0,255,0)
		self.text_color=(255,255,255)
		self.font=pygame.font.SysFont(None,48)

		#创建按钮的rect对象，并使其居中
		self.rect=pygame.Rect(0,0,self.width,self.height)
		self.rect.center=self.screen_rect.center

		#按钮的标签只需要创建一次
		self._prep_msg(msg)

	def _prep_msg(self,msg):
		"""将msg渲染为图像，并使其在按钮上居中"""
		self.msg_image=self.font.render(msg,True,self.text_color,self.button_color)
		self.msg_image_rect=self.msg_image.get_rect()
		self.msg_image_rect.center=self.rect.center

	def draw_button(self):
		#绘制一个用颜色填充的按钮，在绘制文本
		self.screen.fill(self.button_color,self.rect)
		self.screen.blit(self.msg_image,self.msg_image_rect)